Calculating-machine.



A. BOLLINGER & A. & E. LANDRY. CALCULATING MACHINE.

APPLICATION IILED DBO. 5, 1907.

944,841 4 Patented Dec. 28, 1909.

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A. BOLLINGER & A. & E. LANDRY.

CALCULATING MACHINE.

APPLICATION FILED DEC. 5, 1907.

944,841 Patented Dec. 28,1909.

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CALCULATING MACHINE.

APPLIOATION FILED DEC. 5, 1907.

Patented Dec. 28, 1909.

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APPLIOATION FILED DBO. 5, 1907. 944 841 Patented Dec. 28, 1909. 14 SHEETS-SHEET 5.

A. BOLLINGER & A. & E. LANDRY.

CALCULATING MACHINE.

APPLICATION FILED D1105, 1907.

Patented Dec.28, 1909.

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APPLICATION FILED D120. 5, 1907.

944,841, I Patented Dec.28, 1909.

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CALCULATING MACHINE.

APPLICATION FILED DEC. 5, 1907.

Patented Dec. 2 8, 1909.

14 SHEETS-SHEET 8.

& Km Q A. BOLLINGER & A. & E. LANDRY. CALCULATING MACHINE.

APPLICATION FILED DEO.5,1907.

944,841 Patented Dec. 28, 1909.

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APPLICATION FILED DBO. 5, 1907.

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14 SHEETSSHIET 10.

A. BOLLINGBR & A. (in E. LANDRY,

CALCULATING MACHINE.

APPLICATION FILED DEG.5,1907.

Patented Dec. 28, 1909.

14 SHEETSSHEET 11.

my H 7 0 AM J a W/ A. BGLLINGBR & A. & E. LANDR'E, CALCULATING MACHINE.

. APPLICATION FILED DEC.5,1907. 944,841, Patented Dec. 28, 1909.

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CALCULATING MACHINE.

APPLICATION FILED DBO. 5, 1907.

944,841. Patented Dec.28,1909.

14 SHEETS-SHEET 1s.

zl/lilwsyes jwem A. BOLLINGER & A. E. LANDRY.

CALCULATING MACHINE.

APPLICATION FILED DEG. 5 1907.

944,341 Patented D60.28,1909.

14 SHEETS-SHEET 14.

UNITED STATES Errand? OFFICE.

ALEXANDER BOLLINGER, ALCIDE LANDBY, AND EUGEN LANDRY, 0F GEISTEVA,

' SWITZERLAND.

CALCULATING-MACIIiNE.

To all whom it may concern:

Be it known that We, ALEXANDER BOL- LINGER, ALOIDE LANDRY, and EUGEN LANDRY,

residing at Geneva, Switzerland, have incation, but not subtraction and division, can be performed.

The subject of'the resent invention is a calculating machine 0 this type, with which all four species of calculation can be rapidly carried out with absolute accuracy. In adding and subtracting, the figures of the calculation to be made are at the same time printed upon a traveling paper ribbon, so that they can be examined and checked. In like manner, the result of any calculation I whatever can be printed on the ribbon.

The novel features of our improved machine consist essentially in the employment of a rotary ring, det achably connected with the setting wheel and whose groove at two diametrically opposite quarters of the circle lies farther from the axis than at the other two quarters. This ring replaces the ordinary grooved disk and adjusts the teeth by the ring, during a rotation of the main shaft, being arrested by a depressed key of the figure key mechanism, located above the setting IHOClHlXllSlH, until the key locking devices are disengaged; while the teeth with the setting wheel are rotated farther by the main shaft, and set the counting mechanism in rotation, and then, when the machine is adjusted for addition and subtraction, by renewed arrest of the grooved ring are returned to the zero position. In order, vin making an addition or subtraction to, enable printing of the figures of the calculation to be made, figure-segments are provided on the groove rings, and behind the setting mechanism there-is located a printing device in connection with the main shaft.-

The new machine is illustrated'in the accompanyingdrawings.

Specification of Letters Patent.

Application filed. December 5, 190?.

Patented Dec. 28,1909.

Serial No. 405,270.

Figure 1 is a cross section, taken on the line AlB of Fig. 2 and Fig. 2 is a longitudinal section on the line CD of Fig. 1 of the setting wheel drum and key mechanism. Figs. 1*, 1", 1 show in several positions a setting wheel with the main shaft. Fig. 3 is a plan of the key locking plate. Fig. 4 is a plan (partly in section) of the setting wheel drum. Fig. 5 is a section on the line G-l-I of Fig. 4. Fig. 6 is a cross section through the machine. Figs. 2, 6 '6 (3 and 7, 8, 9, 10 and 11 show details to be hereinafter referred to. Fig. 11 is a per spective view of parts of Fig. 11, to be subsequently described. Fig. 12'is a plan of the printing mechanism alone. Fig. 12 shows the driving gear of the printing cylinder. Fig. 13 is a plan view of a calculating machine embodying this invention. Fig. 14 is a front view of Fig..13.

On the main shaft (4 there is slidably but not rotatably mounted the setting wheel drum 7), to whose cylinder 1 the setting wheels 2, 3, 4, 5 are" rigidly connected. Each of these wheels is furnished with nine teeth 6 sliding in radial slots and receiving guidance from grooves provided in the disks 2 3 which are rigidly secured to the setting wheels. On each setting wheel there are also rotatably arranged rings 7, 8, 9, 10 which, however, are held by spring actuated pins 11 (Fig. 1), whose conical ends snap into recesses in the periphery of the setting wheels. These recesses are spaced to cor respond vith the teeth 6. Each ring has a lateral groove 7*, 8 9*, 10 running around it, into which studs or projections 6 on the teeth (3 project, and which at two diametrically opposite quarters of the circle lies farther from the center of the shaft a than at the other two quarters. These grooves 710 thus form so called eccentric or cam grooves. Thus supposing the grooved I ring were to be held stationary during an entire revolution of the setting wheel, the' is marked with the figures 0 to 9 (Fig. 5). In the position of the quadrants and remaining members of the setting wheel drum illustrated in Fig. 1, the figures O of the two quadrants lie diametrically opposite on a horizontal line drawn through the center of the shaft a. This is the zero position of the setting wheel drum.

Above the setting wheel drum b'there is located a key mechanism 0, which is mounted in a common housing with the drum I) between the side-walls 12. The key mechanism, therefore, slides with the setting wheel drum on-the shaft a and is guided by the rods 0, p, 9 (Figs. 1 and 6) secured to the side-Walls 12. In the particular construetion of the machine illustrated there are fourrows of keys 13 provided, correwall 12 of the housing, their lower ends passing through the'curved plate 15. They are maintained in their normal, elevated position by springs l3 which press the noses 13 of the keys against bars 14: secured to the cross rails 14. These latter and the bars 14 constitute-with the walls 1 1 a special frame, which is set in the housing or case 12 of the machine.

At the head 19-of the drum Z) there is provided a lateral, are-shaped rib 20 having inclined end-faces, in whose path of rotation there lies one end of a doublearmed lever 21 fulcrumed to a bracket 21, its other end being pivoted to a toothed bar 22 (see detail view Fig. 2 bar 22 take in front of the yokes 23, which can oscillate to a limited extent on the pins 23 and which are always held to the teeth 22 by springs 24, whereby at the sametime the free end of the lever 21 is kept constantly pressed against the head 19 of the drum 6. Each yoke 23 also lies in front of the whole of the keys'of a row, its position being below the noses 13 of the keys when the latter are in their normal, elevated position (Figs. 1 and 2). The yokes serve to lock the keys in depressed position, being forced back by the chamfered edge of the noses l8 on depression of the keys and then snapping forward above these noses owing to the action of the springs 24:.

By depression of the keys 13, the latter are brought into their operative position, that is to say, with their tail ends inthe path of rotation of projections 16, 16 17, 17 on the grooved rings 7, 8, 9, 10 of the drum I), so that, dependin upon the direction of rotation of the shaft a, the ring 7 8, 9, or 10.,will be arrested by one of the projections 16, 17 or 16*, 17 striking the depressed key. On further rotation of the shaft a the setting wheel 2, 3, 4:, or 5 will continue its revolution since the spring actuated stud 11 will be The teeth 22 of the pressed back out of the recess in which it lies. When the studs 6 of the teeth 6 of the rotating wheel reach an outer portion of the groove 7 8 9 or 10 ,these teeth will be protruded in radial direction, while those teeth 6 whose studs 6? enter the inner portion ofthe groove will be retracted. The rings 710 also present two elevations 25, 25, which likewise serve to arrest the rings 7-10 by contacting with a bar 26, which can be either reciprocated in the direction of length of the drum 7) or radially of the latter, as willbe hereinafter explained.

With the above-described construction of the setting wheel drum and the key mechanism, by a rotation of the shaft a the figures of each setting wheel which are indicated by the depressed key of the corresponding row can be transferred to the counting and indicating mechanism by the appropriate partial rotation of the corresponding wheels 18, effected by the protruded teeth 6. We will explain this by means of an example taking for instance, the case of the setting wheel 3, whose oflice it is on depression of the key whose head is marked at to transfer this number of figures, viz. four. The crank a for turning the shaft a, when in the zero position occupies the position shown in Fig. 1. When rotated toward the right (which in the side view Fig. 1 appears to be a left hand rotation) the grooved ring 8 will at first revolve with the wheel 3, until on the position shown in Fig. 1 being reached the projection 16 reaches the depressed key'13 marked 4L, whereupon the ring 8 is arrested. Until the completion of a semi-rotation, or approximately such, of the crank a that is, until the position shown, in Fig. 1 is reached, the teeth 6 will have been protruded from the wheel 8 and some of them retracted again, in consequence of the studs 6 passing through the outer quarter groove 8 And the arrange ment is such that the number of the teeth 6 which remain in the protruded position is the same as the number (in the present case 4) which is marked on the depressed key. This is brought about by the are-shaped rib 20 after nearly a semi-rotation releasing the depressed key and thus setting free the ring 8. In the position shown in Fig. 1 this has just occurred. The teeth 6, in consequence of the rigid connection" of the setting wheels, with the shaft a, have, in the position shown in Fig. 1 like the crank also been turned through nearly half a revolution; the ring 8, however, has only covered a distance whose length is determined by the depressed key. The outer quarter groove has thus been shifted relatively to the setting teeth 6, in such manner that on completion of the half rotation of the crank there remain as many teeth in the outer portion of the groove (that is, in proally opposite parts of the disk 19.

those grooved rings which are not to be an truded positionj as the number on the depressed key indicates; while the remaining teeth have again receded into the inner portion of the groove 8, that is to say, the portion lying nearer to the center of the shaft a. In the example under consideration, therefore, four teeth remain protruding in Fig. 1", uvhich teeth, on further rotation of the crank, effect advance of the wheel 18 through the distance of four teeth. In order, during the second half rotation of the crank, to retract the protruded teeth again the grooved ring 8 and setting wheel 3 are again shifted relatively to each other, to such extent that on completion of this second half rotation of the crank the ring 8 has executed a semi-rotation relatively to the position shown in Fig. 1. This further shifting is attained by the elevation 25 which strikes anose' 26 of the bar 26, as is shown in Fig. 1, and which projection arrests the ring 8 until the protruding teeth, rotating with. the setting wheel, have left the outer portion of the groove and entered the inner portion, lying nearer to the center of the shaft a, so that they have been retracted again. This is the case when the crank a. hascovered the path from the position illustrated in Fig. 1 to the position shown in Fig. 1, in which the zero position of the setting wheel drum has been reached again, except that the quadrant-piece marked with the numerals 09 and lying to the left of Fig. 1 is now replaced by the opposite quadrant-piece,

In order that the ring 8 may be released at 25 immediately the crank has reached the position shown in Fig. 1, there is provided, preferably on the head 19 of the drum, a cam 27, in whose path of rotation there lies a projection 28 of the bar 26 and w iich as shown in Fig. 10, shifts this bar by means of the projection 28 until the noses 2W are forced sideward of the elevation 25. The cam 27 is so located relatively, to the crank that it will have effected the lateral shifting of the bar 26 by the time the crank has reached the position shown in Fig. 1. ()n the following rotation of the shaft (.0, the partial rotation of the wheel 18 corresponding to the key depressed is effected in the same manner, except that the opposite half of the ring 8 now comes into operation during its semi-rotation, and the projections 16" and 25 will cause two arrests. In order that the' motion of the toothed bar 26 which brings the noses 26 out of the path of the elevations 25, 25* may also take place during the second half rotation of the shaft a, two cams 27 are provided, located at diametric- Thus rested by a depressed key and must thus make a complete rotation find free passage for the elevations 25, 25 past the toothed bar 26.

The direction of rotation for operation of the drum and key mechanism as above described is that necessary for adding and multiplying with the machine; On reverse, that is, left hand rotation of the crank (0 such as is necessary for subtraction and division, the figures indicated by the depressed keys are transferred in like manner by protrusion of the teethv 6; the arrest of the grooved rings then takes place, within a full left-hand rotation of the crank a at'first by means of the projections 17 and then by the projections 25, which strike the noses of the bar 26 as before, but this time from the left, and bring about further shifting of the grooved rings and setting wheels rela tively to each other, while previously the disengagement of the depressed keys, that is, release of the grooved rings at 17 by the arc-shaped rib 20 and lever 21, has taken place from the right.

For the purpose of locking the keys in the elevated position, so that they can not be depressed during rotation of the crank (0 there is provided in the key frame, below the bars 1 1 a sliding plate 29 (Fig. 3), whose slots 29 receive guide-pins. This plate 2t) presents rows of apertures 29/, one 'for each key. At each aperture 29" the wall which lies opposite the chamfered nose 13 of the key is correspondingly inclined, so that when the two chamfcrs abut, descent of the key is impossible. The necessary shifting of the plate 2%) toward the noses 13 is effected automatically by means of a double armed lever 30, which lies against the edge of the plate 29, while its other arm hangs before the head 31 of the drum 5. In

the drum head 31 there is a recess 32, whose two side walls are chamfered, andin which the lever arm 80 lies when the crank (1., occupies the position shown in Fig. 1. The plate 25) is now in the position shown in Fig. 2, in which the chamfered edges of the apertures 25)" are at such distance from the noses of the keys that the latter can be depressed. Immediately the crank how ever, has made a slight. rotation, the lever 30 leaves the. recess 32 and lies in front. of the face of the drum head 31, whereby the lever is oscillated and shifts the plate 29 so as to cause the chamfered edge of the it is indicated to the calculator that the setting mechanism is in the operative position. Moreover the figure set is in this way (itsa Masai played to him until the completion of the operation. .ltn this manner errors are avoided such as might easily occur, were the keys to return directly from the lowest to the highest position beforethe operation has been completed for the number set. The return of the plate 29 into the position shown in Fig. 2, when the lever 30 again provided. This key has a chamfered projection 00 which acts upon a lug 22 on the toothed bar 22, in such manner that 011 depression of the key 33 the bar is pushed to. ward theyok es 23. This causes the teeth 22 to force the yokes sideward to a corresponding extent, so that they release the noses 13 of the depressed keys, which now snap up under the action of the springs 13.

The figures are transferred by the trains of wheels (Fig. t) 18, 18, 34,35, 36, 37 (Fig. 6) mounted onthe shafts a, w, 0?, e, 7 respectively, to the numeral disks 37 connected with the wheels 37 the numerals be ing visible through the windows 38 in thetop of the machine case. In order to prevent unintentional further rotation of these Wheels, locking disks 18 are connected with the wheel 18 (Fig. 1) and on the disks 2 5 of the setting wheels 25 two looking-pieces 39 are provided, in such position that one of them is always before and the other behind the teeth 6. Tn the drawing the lockingpieces are secured to the arc-shaped plate attached to the side of the disks 25 and which serve to guide the teeth 6. The grooved rings 7-'10 also possess peripheral stops which are located immediately in front of the outer quarters of the groove "'-10, so that at the commencement and end of the protrusion of the teeth there is always a locking-piece 39, and one of the stops 40. When, therefore, the figures have been transferred, a locking-piece enters the arc-shaped recess of the locking disk 18 and prevents further rotation of the same and of the corresponding train of wheels. The means for transferring the figures, and the locking-devices, do not however, form any part of the-present invention.

For multiplication and division the posi tion of the bar 26 must be altered, so that the noses 26 come beyond the reach of the projections 25, 25 of the grooved rin 's. This can be effected either by laterally shitting the bar or by turning it in upward direction. Lateral motion can be given to the bar 26, to bring it out of reach of the projections 25, by the cam 27 at the'zero position of the setting Wheel drum, .in the manbar in this position against the action of the spring 26" (Fig. 10), a key 52 is provided, whose tail end takes in-front of a lateral arm 28 projecting from a bracket 28, and having a chamfer 28 In the elevated position of the key 52 and when the noses 26 lie in the path of rotation of the projections 25, the tail end of the key is located above the chamfer 28 so that on depression of the key, the bar 26 is locked by the key. In the depressed position the key 52 is locked by the double pawl 53, 53 (Figs. 10. 11. 11), which are actuated by springs 54, the part 53 of the pawl snapping over a catch 52 on the key The key has also achamfered shoulder '52, with which, at the aperture 52, it acts upon the plate 29 and n depression causes sliding of the latter, which results in locking of those of the keys 13 which have not been set. In conjunction with the key 52 there is a second key 55,. whose ol'lice it is to release the key 52 again, in order to disengage the bar 26, so that the key 52 may be drawn up again into its elevated posltion by the spring 57. To enable this to be done the part 53 pushed down by the catch 52 of the key 52. In depression of the key 55a nose 55 on it comes before the edge of the aperture 55 in the plate 29 and now replaces the key 52 in the operation of locking the plate. At the same time the key 55 itself is held in the depressed position by a double armed pawl 58, the hooked end of the pawl taking over the catch 55 under the action of the sprin 58*. The other arm 58 of the pawl 58 projects into the path of rotation of the cam 27 of the drum head 19, so that the pawl is released from the catch 55 and the key 55, controlled by the spring 55 disengaged, immediately the cam 27 comes against the pawl arm 58;

Figs. 7, Sand 9 show a device for effecting alteration of the position of the bar 26 by an up and down motion. The bar is here guided in radial slots in the side or case walls 12, and is drawn toward the drum by spring 59, so that in the lowermost position it lies with its noses 26 in the reach of the projections 25. For the purpose of'lifting the bar 26 out of the reach of these projections arms 60 are provided on it, and the drum heads 19, 31 are furnished with cams 61 which take below these arms when.the drum is in the zero position. The bar 26 can be locked in the elevated position by a second, longitudinally sliding bar 62, supporting limbs 62 on this bar taking below the arms 63, provided at suitable places" on the bar 26. The bar 62 is shifted by turning her already described. Tn order to hold the a hand lever 64, pivoted to the bracket 65,

and whose free end projects through an aperture in the covering wall 12 The locking of the keys is effected in this device by means of the lever 30 (Figs. 2), not shown in Figs. 7 and 8. For this lever there is a suitably guided ring 66 (Fig. 7) provided at the drum head 31, said ring being detachably held to the latter by a spring actuated pin. 67. This ring is furnished with. the recess 32 for the entrance of the end of the lower 30, and on such entrance as Fig. 2 shows, the keys are released from the sliding plate 29. The ring is also provided at the circumference end with a projection 68. When the bar 26 is brought into the elevated position for multiplication or division and locked by the limbs 62 on pushing the bar 62 (Figs. 7

and 8), the limb 69 of the bar 62 will lie in the path of rotation of'the projection 68, so that the ring 66, on rotation of the crank shaft 0, will be arrested by the part 68 striking against the part 69. This will result in the recess 32 altering its position relatively to the position of the crank and the keys remain locked until in the zero position of the drum the ring 66 is again brought into the normal position by the projection 68 having struck an enlargement 70 on the bar 26, in the same manner as in the case of the grooved rings 710 the noses 26 were held by the projections'25.

In bringing the drum and the key mechanism into the position for multiplication and division, these parts of the machine act upon the rotations indicating mechanism mounted in the front lower part of the case on the shaft 1* and indicating the multiplier or quotient. This is done from the main shaft (1, by means of the gears 71, 72 (Fig. 6) a driving tooth 73 connected with the gear 72, which simultaneously with the adjustment of the bar 26in the position for multiplication and divisi'on,is brought into a protruding position, so that it may, on rotation, mesh with one of the gears 83 of the indicating mechanism on the shaft 1". For this purpose a double armed lever 74. (Figs. 6, 7, 8) is fulcrumcd to the wall 12, the one arm of which, in the form of construction shown in Figs. 10 and 11, takes under the end of the key 52, so that on depression of the key the lever executes a short oscillation. In the form of construction shown in Figs. 7 and 8 this oscillation is caused by the lateral shifting of the bar 62, a chamfer 63 of the bar passing over the end of the lever 74 and depressing it. The other arm of the lever is connected with a slide 75 (Figs. 6 and 6).which works in a guide 75 on the wall 12, and whose lower end engages in a fast disk 76,

5 provided withtwo circular grooves 77 78.

front of this disk there rotates on the often as there are pin, 79 secured to the wall 12, the holder 80 for the tooth 73, which slides radially in the slot 80 and has a stud 73, which can enter both the groove 77 and the groove 78 in the disk 76. The necessary shifting of the tooth 73 for this purpose, is caused by the slide 75, which has a groove 75 (Fig. 6) which in the elevated position of the,slide lies on a level with the groove 78 and in the depressed position of the same with the groove 77, and which embraces the stud 7 3 of the tooth 73 when the crank a of the main shaft a occupies the position shown in Figs. 1 and 6, or the setting wheel drum the Zero position. The holder, 80 is rotated owing to its being originally secured to the toothed wheel 72. If the machine has been set for addition or subtraction, the lever 7 l remains in the position produced by the pull of the spring 74*, in which the slide 75 is moved so far downward that the groove 7 5 lies in concentric position with the groove 77 and the tooth 73 therefore in the retracted position, in which it is retained during its rotation, as the stud 7 3 rotates in the groove 77. Should the lever 74 oscillate, however, as is the case when the machine is set for multiplication or division, the slide 75 lifts the tooth 73 into the operative position, in which the stud 7 3 runs in the outer groove 78.

The holder 80 of the tooth 73 has the edges at each side of the tooth formed as are shaped or rounded rotation in either direction, and after the tooth has effected the described partial rotation of the wheel 83, come into the-correspondingly shaped depressions in the locking disk 85'and thus prevent further rotation of the said disk and wheel 83. The shoulders are cut away at each side of the tooth 7 3 to such extent that the gap admits of the tooth 73 causing the partial rotation of the wheel 83 before the following shoulder locks it.

In performing multiplication, the multiplicand is first set in the key mechanism. Thereupon the bar 26 is brought out of the path of rotation of the projections 25, 25 of the grooved rings 7 8, 9, 10. At the same time the driving tooth 73 has come into the reach of one of the gears of the gear wheel 83. The crank of the main shaft (1 must now be rotated as many times as the multiplier has units in the units place; the number of rotations is then visible in the upper row of windows 88., For carrying the tens of the multiplier the key mechanism must be so shifted that the driving tooth 73 comes within the province of the. tens place of the gears of the gear wheel 83', whereupon the main shaft is again rotated as many times as the tens-number contains units. The shifting of'the key mechanism occurs as laces in the multiplier. The result is then visible in the windows 38.

ortions, which on Tn order to perform division with the machine, it is necessary that the drum and indicating mechanisms occupy the zero position. The setting mechanism is first brought into the extreme left hand position. The dividend is then set in the key mechanism and transferred, by the main shaft being turned to the right, to the numeral disk 87...

Thereupon the divisor is set in the key mechanism, the bar 26 is disengaged by depression of the key 52, or by bringing the limb 62 below the arm 63 of the bar 26, and simultaneously the tooth 78 protruded, in order that it may mesh with the gears 88 of the rotations indicating mechanism. Thereupon the main shaft a must be rotated as many times toward the left as the divisor is contained in the oppositely located places of the dividend, which gives the highest place of the quotient. The setting mechanism is then adjusted from left to right, that is, the tooth 73 is brought into the path of rotation of the next wheel 83 for the second highest place of the quotient. The division of the succeeding places is conducted in the just described manner. The quotient 1S visible in. the window of the lower row 89, while the remainder appears in the window 88.

During the performance of a multiplication or division the keys giving the multiplicand or divisor remain in the middle position (Figs. 1 and 1); after the completion of the operation the drum is set to zero by throwing in the toothed bar 26 and giving the crank one turn to zero, whereby the keys are likewise released.

The construction of the machine is such that in adding or subtracting, the numbers of the calculation to be made can be printed, and the result of the calculation, of whatever nature, printed on a continuous paper ribbon. This is done with the aid of printing mechanism, the arrangement of which is shown in cross section in Fig. 6 and in plan in Fig. 12. This printing mechanism consists of a drum 96 for the paper ribbon 95 and of an ink ribbon 97 which is suitably conducted, by means of rollers, above the paper ribbon, that is, the printing drum, and infront of the latter, at a short distance from it, on the main shaft side.- The paper ribbon is wound on the drum 95 while theink ribbon is wound off the roller 97 and onto the roller 97 or vice versa. The drum 96 is mounted between the plates 98, which are held together by the shafts of the guide rollers for the ink ribbon. The

shaft of the printing drum 96 is prolonged.

on each side beyond the plates 98 and its I ends are mounted in slides 99, which are secured with capability of sliding between the guides 100, 101 afiixed to the machine case.-

grooves 102 of these disks, which receive the studs 99, have at one part a bend 102, which bends on rotation of the main shaft (1, cause reciprocation of the slides 99 and thus a slight oscillation of the drum 96, with the paper ribbon toward the ink ribbon and the shaft a. The disk 102 has also a peripheral notch 102, through which the stud 99 can pass from the groove 102 whereby the printing mechanism can be brought out of connection with the disk 102.

The printing drum, when the printing mechanism is set in operation, will at each rotation of the main shaft a be fed forward through a short distance. This is done by means of a tooth 111 (Fig. 12 ),which turns with the shaft and is preferably provided on the rib 12 of the disk 42. This tooth 111 engages in the intermediate gear 112,

which meshes with the gear 113, mounted 8 fast on the drum shaft. The printing drum has a brake disk 96 (Fig. 12) on which bears a spring 96 (shown in dotted lines in Fig. 6), so that it can not rotate of itself.

In the plates 98 there is mounted another shaft 103, upon which the two gears 10% are secured, which mesh with gears 105, loosely mounted on the shaft of the printing drum, and with each of which there is rigidly connected a cam disk 106. A third gear 107 which sits fast on the shaft 103 is mutilated and engages with a gear 108 mounted fast on the shaft of the drum 96. The printing mechanism is thus partly mounted on the slides 101 and partlyon 1 the shaft 108 in slots 1.03 in the wall of the machine case and so arranged that the printing drum lies below the shaft 11 and on a level with the main shaft (1 and infront of the numeral quadrant-pieces 7. On ad 1 vance of the printing drum by the disk 102 with its grooves 102;, therefore, the number on the numeral quadrant opposite the printcorrespond with the numeral disks 37 mounted on the shaft f, in front of the win- 1 (lows 38, and which are so located that the samenumber which appears in the window 38, lies on the numeral disks 3-1 in the line connecting the center of the printing drum with the center of the shaftw. The printing drum then occupies the position shown in Fig. 6, in which .the pins 99 are located in the round part of the grooves 102 and thus at a distance from the shaft a. The numerals of the result visible in the windows 38 at the same time stand on the numeral disks 3 1 above the printing drum 96. In order now that these numerals, that is, the result, may likewise be printed on the paper ribbon of the drum 96, the latter is 1 

